Features AW00123402000
242 Basler ace USB 3.0
8.17 Chunk Features
8.17.1 What are Chunk Features?
In most cases, enabling a camera feature will simply change the behavior of the camera. The Test
Image feature is a good example of this type of camera feature. When the Test Image feature is
enabled, the camera outputs a test image rather than a captured image.
When chunk features are enabled, the camera develops some sort of information about each image
that it acquires. In these cases, the information is added to each image as a trailing data "chunk"
when the image is transferred to the host PC. Examples of this type of camera feature are the frame
counter feature and the time stamp feature. For example, when the Gain chunk is used, the camera
checks, after an image is captured, the gain All parameter value used for the image acquisition and
develops a data chunk to be appended to the image data. And if the time stamp chunk feature is
enabled, the camera develops a time stamp data chunk. The gain and the timestamp data chunks
would be added as trailing data to each image as the image is transferred from the camera. The
features that add chunks to the acquired images are referred to as “chunk” features.
After the data chunks were transmitted to the PC they must be retrieved. For more information
about retrieving chunk data, see Section 8.17.4 on page 250.
8.17.2 Chunk Mode Active
When Chunk Mode Active is enabled, the camera is in a state where it can generate and append
chunk data to image data and transmit them to the PC.
Note that chunk data can only be appended to image data when Chunk Mode Active is
enabled. Disabling Chunk Mode Active prevents chunk data from being to be appended to
image data.
The individual data chunks, e.g. the Gain chunk, can be selected to be
appended to image data regardless of whether Chunk Mode Active is
enabled. However, the selected data chunks will only be appended if Chunk
Mode Active is enabled.
Image data with related supplementary data are counted as chunk 1 (for
more details, see Section 8.17.4 on page 250). Despite this fact, image data
(i.e. the data for chunk 1) can be obtained even when Chunk Mode Active is
disabled. In this case, however, no trailing chunk data will be transmitted to
the PC, even not if individual data chunks are currently selected.
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